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I googled cat contraceptives and found some limited info re wild carrot seeds. The problem I would like to address is keeping feral cats from reproducing when the cats in question cannot be caught in order to get them spayed. There are doses and recommendations for humans, but I couldn't find any specific instructions for cats. Human females can use a wild carrot seed tea as a "morning after" pill. Cat ovulation, however doesn't occur at specific time intervals, but occurs when daylight hours are long enough and then occurs every 2-3 weeks until the cat is impregnated. I guess this would mean one would have to give the cats the tea (if that's safe to give to cats) every day during the months there is long enough daylight time for them to ovulate. Also, altho it may keep them from getting pregnant, it would not stop the mating behavior such as midnight yowling, etc. I wish I could find a method of sterilizing these cats other than spay surgery.